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Date: Thu, 03 Mar 2011 18:46:23 +0100
From: Eric Dumazet <eric.dumazet@...il.com>
To: Lucas Nussbaum <lucas.nussbaum@...ia.fr>
Cc: netdev@...r.kernel.org, Sangtae Ha <sha2@...u.edu>
Subject: Re: Bad performance when CUBIC HyStart enabled
Le jeudi 03 mars 2011 à 18:37 +0100, Lucas Nussbaum a écrit :
> I had 6 successful transfers. There's the netstat -s output after the 5
> first successful transfers. Then the 7th transfer showed the problem,
> as well as the 8th and the 9th. There's the netstat -s output after each
> of them.
Its a bit strange : my 'netstat -s' are more verbose than yours :
netstat -s
Ip:
1033944 total packets received
0 forwarded
0 incoming packets discarded
1033705 incoming packets delivered
701852 requests sent out
4 dropped because of missing route
120 reassemblies required
60 packets reassembled ok
60 fragments received ok
120 fragments created
Icmp:
704 ICMP messages received
0 input ICMP message failed.
ICMP input histogram:
destination unreachable: 177
timeout in transit: 117
echo requests: 103
echo replies: 307
693 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 177
echo request: 413
echo replies: 103
IcmpMsg:
InType0: 307
InType3: 177
InType8: 103
InType11: 117
OutType0: 103
OutType3: 177
OutType8: 413
Tcp:
10526 active connections openings
212 passive connection openings
78 failed connection attempts
300 connection resets received
26 connections established
969786 segments received
690213 segments send out
894 segments retransmited
0 bad segments received.
305 resets sent
Udp:
43123 packets received
4 packets to unknown port received.
0 packet receive errors
9570 packets sent
UdpLite:
TcpExt:
877 TCP sockets finished time wait in fast timer
23798 delayed acks sent
10 delayed acks further delayed because of locked socket
Quick ack mode was activated 598 times
542574 packets directly queued to recvmsg prequeue.
140834 bytes directly in process context from backlog
45033318 bytes directly received in process context from prequeue
646384 packet headers predicted
81439 packets header predicted and directly queued to user
24971 acknowledgments not containing data payload received
189383 predicted acknowledgments
2 times recovered from packet loss by selective acknowledgements
3 congestion windows recovered without slow start by DSACK
308 congestion windows recovered without slow start after partial
ack
2 TCP data loss events
3 timeouts after SACK recovery
2 fast retransmits
1 retransmits in slow start
632 other TCP timeouts
9 times receiver scheduled too late for direct processing
587 DSACKs sent for old packets
2 DSACKs sent for out of order packets
417 DSACKs received
130 connections reset due to unexpected data
72 connections aborted due to timeout
TCPDSACKIgnoredOld: 176
TCPDSACKIgnoredNoUndo: 56
TCPSackMerged: 5
TCPSackShiftFallback: 4
TCPDeferAcceptDrop: 106
IpExt:
InNoRoutes: 5
InMcastPkts: 35832
OutMcastPkts: 1403
InBcastPkts: 19536
OutBcastPkts: 89
InOctets: 787953535
OutOctets: 113825814
InMcastOctets: 4098542
OutMcastOctets: 211245
InBcastOctets: 1906912
OutBcastOctets: 13625
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